115747372921 has 2 divisors, whose sum is σ = 115747372922. Its totient is φ = 115747372920.

The previous prime is 115747372877. The next prime is 115747372927. The reversal of 115747372921 is 129273747511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114680436025 + 1066936896 = 338645^2 + 32664^2 .

It is an emirp because it is prime and its reverse (129273747511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115747372921 - 2⁹ = 115747372409 is a prime.

It is a super-2 number, since 2×115747372921² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (115747372927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57873686460 + 57873686461.

It is an arithmetic number, because the mean of its divisors is an integer number (57873686461).

Almost surely, 2^115747372921 is an apocalyptic number.

It is an amenable number.

115747372921 is a deficient number, since it is larger than the sum of its proper divisors (1).

115747372921 is an equidigital number, since it uses as much as digits as its factorization.

115747372921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740880, while the sum is 49.

The spelling of 115747372921 in words is "one hundred fifteen billion, seven hundred forty-seven million, three hundred seventy-two thousand, nine hundred twenty-one".